The car bomb attack that hit the Turkish capital, Ankara, has killed 28 people, with 61 seriously injured. The blast, on 17 February, which targeted military personnel inside a bus, occurred when the vehicle was only a few hundred metres from the military headquarters, the prime minister's office and parliament. Both President Recep Tayyip Erdogan and Prime Minister Ahmet Davutoglu have cancelled their foreign visits to deal with the security situation.

The car, which was laden with explosives, was detonated while the convoy of military buses carrying dozens of soldiers, stopped at traffic lights in the city centre. Ambulances and emergency vehicles attended after the blast was heard and large plumes of smoke were reported by residents throughout the area.

Turkish army service buses burn after the explosion in AnkaraDefne Karadeniz/ Getty Images

Emergency workers help an injured person on the ground near the site of the attack targeting a convoy of military service vehicles in AnkaraCihan/ AFPA firefighter tries to put out a fire as Turkish army buses burnErhan Ortac/ Reuters

Forensic specialists and Turkish police have begun clearing the roads after the incident, with many damaged cars being towed away, while the entire area has been closed off to the public. Relatives of those killed in the blast mourned for the loved ones in a morgue close to where the attack occurred.

Turkey is showing signs of concern at the advance of Kurdish rebels, capitalising on the conflict in neighbouring Syria. There is speculation that the attack may have been carried out by either the Kurdish extremists or the Islamic State (Isis/Daesh).

Relatives of the Ankara car bombing victims mourn outside a morgue in Ankara, TurkeyUmit Bektas/ ReutersRelatives of the Ankara car bombing victims mourn outside a morgue in AnkaraUmit Bektas/ ReutersRelatives of the Ankara car bombing victims mourn outside a morgueUmit Bektas/ ReutersRelatives of the Ankara car bombing victims mourn outside a morgue in AnkaraUmit Bektas/ ReutersTurkish forensic experts inspect the explosion scene in AnkaraAdem Altan/ AFPTurkish police take away a damaged car a day after the explosionAdem Altan/ AFPA car which was damaged in the explosion is removed from the siteUmit Bektas/ ReutersForensic experts examine a street near the site of the explosionUmit Bektas/ ReutersTurkish police remove a damaged carAdem Altan/ AFPThe entrance of a street which leads to the site of the explosion is blocked by canvasUmit Bektas/ ReutersSmokes rises above buildings following an explosion after an attack targeted a convoy of military service vehicles in AnkaraGetty ImagesA firefighter tries to put out a fire as Turkish army buses burnErhan Ortac/ ReutersTurkish police secure the site of the explosionAdem Altan/ Getty ImagesA wounded man is carried to an ambulance after the explosionDefne Karadeniz/ Getty ImagesA wounded man is carried to an ambulance after the explosionDefne Karadeniz/ Getty ImagesTurkish police officers block a street after the explosionUmit Bektas/ ReutersPeople carry a wounded manDefne Karadeniz/ Getty ImagesTurkish army service buses burn after the explosionDefne Karadeniz/ Getty ImagesTurkish police secure the site of the explosionAdem Altan/ Getty Images